PSI - Issue 75

Sébastien Boudevin et al. / Procedia Structural Integrity 75 (2025) 72–84 Author name / Structural Integrity Procedia (2025)

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Vibration spectra aim at specifying accelerated validations profiles for durability shaker test. These specifications, generally synthesized from cumulative FDS over different mission profiles, are designed for a wide range of usages, whose processing can be facilitated through configurable dashboards with automated post-processing flows. To meet a target reliability level that considers the critical level of potential failures, it is essential to develop validation profiles, for design and testing, which consider statistical and probabilistic approaches based on huge data measurements from mixed mission profiles. As part of deriving Validation Profiles, the following application have been explored. The heat pump application needs PSD profiles aimed at being turned to specifications for shaker table. These profiles are designed to synthetize a wide range of usages, facilitated by a configurable dashboard for post-processing. For instance, in the case of Promoov project, the focus is on exploring potential usage and designing the proper battery size. For excavators, the goal is to qualify/optimize efficiency of the electrified architecture according to various business scenarios such as roadworks and landscaping. For telehandlers, the usage is turned to structural fatigue specifications. This includes evaluating the vibratory environment of components like radiators and cabin air conditioners, as well as ensuring the durability of powertrain for electrical components. Additionally, the power and energy consumption at the hydraulic systems level are analysed to optimize the electrified version of the telehandlers. As a result, CETIM needs to invest in a big data infrastructure for test measurements, combining: ✓ Ability to share and display interactively measured test data ✓ Ability to extrapolate retained parameters (Fatigue, Vibration Fatigue, Energy) to target life, either independently by the manufacturer or by the CETIM with a dedicated platform ✓ Capitalize the contextualized test database The acquisition of numerous measurement signals requires standardization and cleaning of the signals, allowing for their mass processing. To achieve this, the signals are denoised, offsets corrected or taken into account as metadata, significant temperature drift corrected. The channels are set to the correct physical unit, or sign convention, and data saved in a standard nCode GlyphWorks format. A channel dictionary is established before the measurements, and assigned to the measurements with a standard naming convention. 3.2. New channels creation Starting from clean measured data, an important step is to calculate new sets of channels, based on formula with existing ones. The formalization of virtual channels to be created is described below: ✓ Hydraulic power by instrumented component ✓ Mechanical power P(t) from torque M(t) and CAN rotation speed S(t), force-displacement for arm component (nCode GlyphWorks 2025) ( ) = 9 (.5 )4 8 (8 ) (1) ✓ Active, reactive and apparent electrical powers by component (DC or AC) and efficiency between two components, with possible combinations for component chains (e.g dual motors). 3. Tests and Signal processing 3.1. Data cleaning